I believe you want to backup the WPA.DBL file. It is located in the system32 folder. It can be backed up to permit activation if you reload Windows XP. You can also experiment with different hardware configurations and restore the file to roll back. You would back up WPA.DBL for each configuration change, so you can roll back whenever desired, similar to what developers may do. If you save a copy of the WPA.DBL file at each change of hardware, you can roll back to almost any state.
Keep in mind that the WPA.DBL is not protected like other system files. In other words, if you delete the file, you will need to reactivate. The WPA.DBL is also not included in Windows XP's system restore mechanism.
http://www.extremetech.com/article2/0,3973,11227,00.asp
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